Java regex for math terms

Asked Dec 12 '18 at 13:29

Active Dec 12 '18 at 13:35

Viewed 34 times

Im trying to make regex for Math terms. The rules are at beginning very simple: no variables, and operators are + -. Something I come up with was :

^[(]*-?\d+(\.\d+)*([+-]{1})*(([(]*-?\d+(\.\d+)*([+-]{1})*[(]*(-?\d+(\.\d+)*([+-]{1})*[)]*)*)*([+-]{1})*)*[+-]{1}-?\d+(\.\d+)*[)]*

Functioned for complicated terms but for those not complicated not. Any advice ?

edited Dec 12 '18 at 13:35

Ole V.V.

asked Dec 12 '18 at 13:29

CreativeStudent98

1

Do you have any sample data which you expect it to match, but it does not? – Mark Dec 12 '18 at 13:29
What are “complicated terms”? Note that matching parentheses isn’t regular language, so a regex isn’t suitable. – Sebastian Simon Dec 12 '18 at 13:30
I have the strong feeling a proper parser would be more suitable and easier to understand and build than a regex, especially for complex terms. – Thomas Dec 12 '18 at 13:31
Sample data: (3+2)*5+((2/2) - (3*4)*5) that would be also "complicated term", one simpler would be 2+2 Parser like ? – CreativeStudent98 Dec 12 '18 at 14:20
Please provide examples of the complicated terms that your regex successfully finds and the simple terms that your regex fails to find. Then we can help you. – James Dunn Dec 12 '18 at 16:47
(3+2)*5+((2/2)-(3*4)*5) works fine bur 3++3 for example not – CreativeStudent98 Dec 12 '18 at 18:35

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